Selective monochlorination of methane via elimination of dichloromethane from the oxychlorination product stream

Mechanistic Insights into the Lanthanide-Catalyzed Oxychlorination of Methane as Revealed by Operando Spectroscopy

“…In the upgrading of CH 3 Cl into olefins, even small amounts of CH 2 Cl 2 cause rapid zeolite deactivation and thus CH 2 Cl 2 needs to be removed from the feedstock. 20 This increases the cost to separate CH 3 Cl and requires the development of, for instance, the hydrodechlorination process to convert poly-chlorinated CH 4 into CH 3 Cl. 29 Olah et al found that inserting an electrophilic Cl atom catalytically over solid (super)acids could reverse CH 4 overfunctionalization and obtain high yields toward CH 3 Cl for direct chlorination.…”

“…Compared to other direct conversion routes of CH 4 , high selectivity to the desired product and relatively high conversions can be achieved, while being operated under moderate reaction conditions ( i.e., in the 400–600 °C temperature range and with p = ∼1 bar) . Chlorinated methanes (CMs) are commodity chemicals, and CH 3 Cl is especially of great interest due to the chemical analogy between CH 3 Cl and CH 3 OH. , It can serve as a building block for the production of added value commodity chemicals, such as ethylene, propylene, and acetic acid. , Therefore, a high selectivity to the desired CH 3 Cl is of great interest in the open literature − ,,− and in the patent literature. ,− However, the selective conversion of CH 4 into CH 3 Cl remains challenging. The polarized bonds in the functionalized molecule are often more reactive than the inert C–H bonds present in CH 4 , resulting in undesired byproduct formation. , For MOC, other chlorinated products, such as CH 2 Cl 2 , are thus also obtained.…”

“…The polarized bonds in the functionalized molecule are often more reactive than the inert C–H bonds present in CH 4 , resulting in undesired byproduct formation. , For MOC, other chlorinated products, such as CH 2 Cl 2 , are thus also obtained. In the upgrading of CH 3 Cl into olefins, even small amounts of CH 2 Cl 2 cause rapid zeolite deactivation and thus CH 2 Cl 2 needs to be removed from the feedstock . This increases the cost to separate CH 3 Cl and requires the development of, for instance, the hydrodechlorination process to convert poly-chlorinated CH 4 into CH 3 Cl …”